ML19344D599
| ML19344D599 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 02/28/1980 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| IEB-79-27, NUDOCS 8004250103 | |
| Download: ML19344D599 (2) | |
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-ftC NSIC ARKANSAS POWER & LIGHT COMPANY STATE POST CFRCE box 551 UTTLE POCK. AAKANSAS 72203 (501) 371-4000 i
February 28, 1980 2-020-15 Mr. K. V. Seyfrit, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Comission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011
Subject:
Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6 IE Bulletin 79-27 Loss of I&C Power (File:
2-1510.1)
Gentlemen:
In response to the required actions of the subject bulletin, the follow-ing is provided.
1.
We have reviewed the Class 1-E and non-class 1-E besses supplying power to safety and non-safety related instrumenta ; ion and control and found no such busses which could affect the ability to achieve a cold shutdown condition.
In mh case, indication of a monitored parameter required to achieve a cold shutdown was urovided with re-dundant indication powered from a separate source.
This review has confirmed our design conformance to IEEE-279 as discussed in the ANO-2 FSAR Section 7.4.2.1.
One portion of this iaction reads as follows:
".... Single failures considered include electrical faults (e.g. open, shorted or grounded circuits) and physical events (e.g.
fires, missiles) resulting in mechanical damage.
Compliance with i
single failure criterion is accomplished by providing redundancy of power supplies, actuation circuits, and by separating the redundant elements electrically and physically to achieve f.he required inde-pendence."
2.
We have reviewed our existing emergency proceduras and feel that they are presently adequate to achieve a cold shutdown condition upon loss of power to any Class 1-E or non-class 1-E bus supplying power to safety or non-safety related instrument and control system.
We have, therefore, not prepared emergency procedures as you re-j quested.
We do not agree, based upon our response in 1 above, that this situation would require actions on the implementation level of an emergency procedure.
Other procedures are presently available for restoring power to a bus, but they are not what we consider
" emergency procedures".
8004250ID'3,
o 2-020-15 February 28, 1980 3.
No design modifications or administrative controls are proposed as a result of our review of operating experience and our re-review of IE l
Circular No. 79-02 as requasted.
Very truly yours, OM f. Y David C. Trimble Manager, Licensing DCT: ERG:skm cc: Mr. Victor Stello, Jr., Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
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